Working with blood banks in the US as well as countries in South America and Europe, a series of official Walking Dead pop-up stores will offer merchandise in exchange for donations of the red stuff. The more blood you give them to chill, the better the goodies you will be able to walk out with.

A recent trial in Portugal saw a spike - including a 571% leap in donations while 67% of participants were first-time donors. Countries that will be involved with the next phase of the blood-letting include the US, Spain, the Netherlands, Turkey, Colombia, Argentina and Brazil. More details on the official site.